Warp stop mechanism for looms



Oct. 13, 1925- M. L. STONE wmp s'roP rmcmmsnvon Looms Filed' April 15,1925 2 Sheets-Sheet 1V l/llll'llll Oct 13, 1925' M. L. sToNE AWAR? STOPMECHNISI P OR LOOMS l Filed April 13, 1825 2 Sheets-Sheet 2 li ,n

Patented Get. 13, 1925,

UNITED S'iiiTESl PATE-NT OFFICE.

MnLvIN L. STONE, or LAWRENCE, MAssAonUsn'rTs-l, Assrsnon To nnAPnnoonieonn- TION, or HOPEDALE, MASSACHUSETTS, A CORPORATION or MAINE.

WAR? STOP MECHANISMI FOB LOOMS.

Application inea April 1a, 1925. serial No. 22,660.

To all whom t may concern 13e it known that I, MELVIN L. STONE, acitizen of the United States, and a resident of Lawrence, in the countyof Essex and State of Massachusetts, have invented an Improvement inlarp Stop Mechanisms tor Looms, of which the following description,

. in connection with the accompanying drawings, is a specification, likecharacters on the drawings representing like parts.

This invent-ion relates to warp stop mechanisms for looms and moreparticularly to that type wherein a detector having a detecting movementtransversely to the series of drop wires is arrested when a drop wiretails to be supported by a warp thread.

It is now the common practice to support a series or row of drop wiresby the warp threads during weaving, and to provide a detector which maybe arrested in its detecting movement by one ot the drop wires when ittails to be supported by a warp thread, and thereupon eiect loomstoppage. In this general type of warp stop mechanisms, the drop wiresare guided in their movements by drop wire guides or bars, and when awarp thread fails to support a drop wire and the loom is stopped, asindicated, it is desirable to locate the warp fault, in order that thebroken end 'or too slack warp thread may be corrected.

One ot the objects ot the present invention is to provide a warp stopmechanism of the above general type with a drop Wire guide which isnormally stationary during 'weaving but which is moved longitudinally orlengthwise by actuation ot theloom stopn ping means.

r to thereby locate the warp fault..

The invention and vnew combination ot parts will best be made clear'from the tollowingdescription and the accompanying drawings of one goodform thereof.

In the drawings: Fig. 1 is a perspective view ot' a loom equipped withthe present invention;

Fig.'2 is a cross-section through the main parts of the Warp stopmechanism, showing more particularly the detector or vibrator and therelation of the drop wires thereto during normal weaving operations;

Fig. 3 is an enlarged transverse section of the main portions of thewarp stop mechanism, showing a fallen drop wire displaced laterally ortransversely of the loom when the stopping mechanism is itself actuatedto stop the loom.

The advantages and results secured by the present invention are bestmanifested in a warp stop mechanism of the general type shown anddescribed in the patent to Carl I). Brown, No. 1,362,670, dated December21, 1920, and in the present embodiment ot the invention it is shownassociated with such a warp stop mechanism, althoughobviously, theinvention may be associated withother forms of stopping means.

The` loom vtrame 1 may be of usual construction, having the usual lay 2which is provided with a bunter 3. The shipper 4 is normally held inrunningposition for the loom by a shoulder 5 on the shipper stand, andpivotally supported on the loom trame at 6 is a shipper knock-oit,comprising an arm 7 which bears against the shipper to eiect loomstoppage when the knock-oli' is actuated.

Mounted in a suitable bearing 8 and supported by an arm 9 connected tothe loom trame isa rock shaft 10` having secured thereto the governo-r11, andmounted for rocking and sliding movement is a dog or fish-tail 12associated with a knock-off head 13 having a slot 111 into `whichprojects the pin 15 extending `trom the dog 12. The knock-off head 13 isprovided with a`slot 16 which embraces the shaft 10, the constructionbeing such that should the dog 12 be moved rearward by the bunter 3, theknockoff head 13 would likewise be moved rearward in the persentinsta-nce, and through a connecting rod 17 joined` to the knock-offlever 7 effect loom stoppage.4

The shaft 10 is provided with an arm 18 which is connected by a rod 19with a rocking armf20, normally actuated by the detector or vibratorduring normal operation of the loom. In the present instance, the

arm 20is connected to a rock shaft 2l whichy has the arm-22 connected bya rod 23 with an arm 24, Fig. 1, secured to the detector shaft 25, sothat on rocking movement of the detector shaft, the roel; shaft 1Q willbe rocked and control the position ofthe dog 12.v

The detector shaft 25 maybe given its rocking or vibrating movementthrough any suitable means, andras shown, it is soactuated bya rod 26which .extends downwardly and is 'actuated' from a collar on a lower orcam shaft, as more fully shown and de.- scribed-in the patent tofiown,`above men'- tioned. I

The detector shaft has rising therefrom the detector supporting arms 2K7on'which 1s mountedthe dete'ctor28,l Figs. 21and 3. The parts-sedescribed may be conveniently and' advantageously formed and associatedas more fully` shown andv described inthe Carl D. Brown patenti AMounted upon the loein frame, one at each-side thereof, arethesupports29for the main' portions ofthe warpstopmechanism, and to the supports'29 are adjustably sev cured the side framesy 30which are shown providedwith the extended-bifurcated lugs 31 resting upon the support-s 29,uandadjust ablysecured thereto by bolts Extending betweenfthe side frames30 are the fixed warp suppoirtsf33, Figs. 1` and2, cach of whichhasat'its lower portion a too.thed..strip 34:-betweeniwhich and thedetector. 28a drop wire 35 may be engaged by the detector when they dropwire fails to besupported by a warp thread.

In the present instance of the invention, the. drop wires 35 are each,provided with an eye 36 through each of which extends a warp thread anormally resting on the top portion of the ixed bars 33 constitutedinthe present .instance as warp supports.

The drop 'wires 35 may be variously contrived, but" in the presentinstanceeach is shown'provided with an elongated slot 37 through whichextends the. drop wire guide 38, whereby the drop wires are guided ordesde@ vin their incremente -In'the pre'sentfinventionj are shown twodropwire guides 38, butv obviously, any number 0f Such' 'guides may.@employed i171 accordance withth'enuinher of rows ofjdrop wires, andeach of'theV drop wire guides 38 carries projections which are adaptedto be engaged by a drop wire when it fails to besupported by a warpthread. The projections on the drop wire guides are preferably formed asteeth 39 having tapered end portions and extending upwardly from each ofthe drop wire guides, the construction being such that should a dropwire fail or be not supported by a warp thread, it will engage betweenthe teeth or projections of the drop wire guide associated therewith.

In the general type of warp stop mechanism wherein the drop wires areassociated with drop wire guides and a vibrating detector, the drop wireguides themselves are ordinarily iixed or secured to the side frames orsupports 30, one at each side of the loom, but in accordance with thepresent invention the drop wire guides 38 are mounted in the side framesor supports 30 for lengthwise movement relative thereto and'may. beconveniently held in the guide,-

ways 40 by cap plates 41-.

During normal weaving operation, the drop'wire guides 3.8 are stationaryand act solely as a meansfor guidingthe movement of the drop wires, butin accordance with the present invention the drop wire guides areassociated with the stopping mechanism which when actuated or moved tostop the loom, impart to the drop wire guide or guides a movementthereof lengthwise or transversely of the loom, with the result thatwhen the loom is stopped or arrested by the detector 28 underk theiniuence of a fallen drop wire and the lower end thereof is caught orheld between the serrated edge portion ofthe fixed bars 34 and thedetector, the upper end portion of the fallen drop wire will be movedlaterally, as indicated in Fig. 3, to indicate the warp'fault.

In the present instance of the invention where-two'drop wire guides areshown, they are connectedor joined together at their proJectmg endportions' 42 by a bar 43 carried by afblock'44'havingfa pin 45 extendingtherefrom and engaged with a slot' 46 in a transversely movablearm 47Fig. 1.

'I he arm 47 is carried by the shaft 48 which is conveniently held in abearing 49 carried by a bracket 50 secured to the loom frame and ismaintained in suitable relation to such bearingvby collars 5 1, oneabove and the other belowl the bearing 49.

Extending outwardly from one of the bearings `51 (the lower one in thepresent instance)` is a pin 52 which is engaged by a bifurcated end ofAa rocker 53 mounted on a roel: shaft- 54 supported in a bearing 55carried by the loom frame. Iny the present instance, the arm 53 extendsbelow the rock shaft 54 and is connected at 56 to an aetuating rod 57which may be suitably guided for endwisemovement in the bearings 58adjustably mounted on the loom frame, and the forward end of the rod 57is positioned 'ien adjacent the rear end portion of the knockof head 13,as indicated in Fig. 1, the construction being such that should the head13 be moved rearwardly by engagement of the dog 12 with the bunter 3 onthe lay, the rod 57 will be likewise moved rearwardly to thereby turnthe rock shaft 48 and impart to the connected drop wire guide or guidesa lengthwise movement, whereby the fallen drop wire will be movedlaterally, as indicated in Figs. 1 and 3, to indicate the warp fault.

During normal operation of the loom, the drop wire guides will remainfixed or stationary and afford means for directing the movement of thedrop wires, but when a warp thread breaks or becomes too slack, theassociated drop wire will fall into the path of movement of the detector28 and thereby arrest movement of said detector and position the dog 12,through the train of mechanism described, for engagement by the bunter 3on the lay as the latter moves backward, and loom stoppage will beeffected. As the dog 12 is thus moved rearward by the bunter, theknock-off head 13 will likewise be so moved, and as the loom is stoppedby such movement of the knockoif head, the rod 57 will be movedlengthwise to effect lengthwise movement of the associated drop wireguide or guides to move the top portion of such fallen drop wirelaterally, as in Figs. 1 and 3, and thereby effectively locate the warpfault.

From the construction described it will be apparent that loom stoppageis effected by the detector 28, and upon movement of the stopping meansto stopping position, the drop wire guide or guides will be movedlengthwise and locate the warp fault by movement of the upper endportion of the fallen drop wire laterally, while the lower end of thedrop wire will be held clamped between the detector and the cooperatingfixed bar 34.

That is claimed is:

1. In a warp stop mechanism for looms, the combination of a series ofdrop wires, a drop wire guide normally stationary during weaving andhaving projections for engaging a drop wire when it fails to besupported by a warp thread, a detector having a detecting movementtransversely of the series of drop wires, loom stopping means forstopping the loom when the detector is arrested in its movementtransverse to the series of drop wires, a push bar actuated by movementof the loom stopping means, a shaft connected to the drop wire guidesand rocked by the push bar to impart warp fault locating movement to thedrop wire guide.

2. In a warp stop mechanism for looms, the combination of a row of dropwires, a drop wire guide normally stationary during weaving, a vibratingdetector below the drop wires, loom stopping meansincluding a dogrendered operative by lay movement to stop the loom when a drop wirearrests the detector, and connections between the dog and drop wireguide to impart warp fault locating movement to the drop wire guide byoperative movement of the dog by the lay.

3. In a warp stop mechanism for looms, the combination of a row of dropwires, a ,dropv wire guide mounted for longitudinal movement andnormally stationary during weaving, a vibrating detector below the dropwires, loom stopping means rendered operative to stop the loom when adrop wire arrests the detector, a rock shaft connected to the drop wireguide and connections between the loom stopping means and rock shaft toimpart warp fault locating movement to the drop wire guide by operativemovement of the roclr shaft by the loom stopping means. j

t. In a` warp stop mechanism for looms, the combination of a series ofdrop wires, a normally stationary drop wire guide, a detector having adetecting movement, a dog positioned for engagement by the lay to stopthe loom when the detector is arrested by a drop wir-e, a rock shaftmounted for rocking movement adjacent the warp stop mechanism, andconnected to the drop wire guide, and a rod between the rock shaftand-dog for imparting movement to the drop wire guide by lay movement ofthe dog.

5. In a warp stop mechanism for looms, the combination of a series ofdrop wires, a drop wire guide, a vibrating detector movable transverselyof the seri-es of drop wires, a fixed bar against which the detectorholds a drop wire when it fails to be supported by a warp thread and thedetector is arrested, a loom stopping dog adapted to be engaged andmoved lengthwise by the lay when the detector is arrested by a dropwire, a rod adapted to be moved by lay induced movement of the dog, andmeans between the dog and drop wire guide' for moving the drop wireguide lengthwise when the dog is moved lengthwise to thereby locate thewarp fault.

6. In a warp stop mechanism for looms, the combination of a series ofdrop wires, a drop wire guide, a detector having a detecting movement,loom stopping means including` a dog, the lay having a bunter,connections between the dog and detector for operatively positioning thedog for engagement by the bunter when the detector is arrested by a dropwire, and means actuated by the dog when moved by the bunter to displacethe drop wire guide and locate the warp fault.

7. In a warp stop mechanism, the combination of a series of drop wires,a drop wire guide having teeth to engage a drop' Wire, a detectoi`having a detecting movement, the lay having a bunter, stopping meansincluding'a dog controlled by the detectoi` and positioned formovement/by the bunter when the detectoi` is arrested, and meansactuated by movement of the dog for imparting lengthwise movement to thedrop Wire guide to locate the fallen drop Wire.

8. In a drop Wire mechanism for looms, the combination of the lay havinga bunter,

drop Wires, a drop Wiiefguide, a detector 15 for controlling the dog,and means actuated by the dog` for moving the drop Wire guide to locatethe Warp fault.

In testimony whereof I have signed my name to this specification.

MELvIN L. STONE.

